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(No Model.) V 3 Sheets-Sheefl. J. H. TANG'YE & W. JOHNSON, J1. GUT-OPPMECHANISM FOR SLIDE VALVES No. 380,955. Patented Apr. 10', 1888.

(No Model.) 3 Sheets-Sheet 2. J. H. TANGYEKE W. JOHNSON. Jr.

GUT-OFF MECHANISM FOR SLIDE VALVES. 180.380.955. Patented Apr. -10,1888.

l@ ME (No Model.) 3 Sheets--Sheet 3.

J. H. TANGYE a; W. JOHNSON, Jr. GUT-OFF MECHANISM FOR SLIDE VALVES.

N0. 380,955. Patented Apr. 10, 1888.

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JOHN HENRY TANG-YE, OF SOHO, AND WILLIAM JOHNSON, JR, OF MOXLEY, COUNTYOF STAFFORD, ENGLAND.

SPECIFICATION forming part of Letters Patent No. 380,955,.datec'l April10, 1888.

Application filed November 22, 1887. Serial No. 255,906.

(No model.) Patented in England February 18, 1885, No. 2,230; in

France November 18, 1885, No. 172,367; in Victoria August E), 1886, No.4,662, and in New South Wales October 6, 1886,

To all whom it may concern:

Be it known that we, JOHN HENRY TANGYE, of Soho, in the county ofStafford, England, and WILLIAM JOHNSON, the younger, of MOX- ley, in thecounty of Stafford, England, subjects of the Queen of Great Britain,have invented Improvements in Automatic Out-Off Mechanism for theSlide;Valves of Steam-Engines and Oompressed-Air Engines, (for which wehave obtained a patent in Great Britain, No. 2,230, dated February 18,1885; a patent in France, No. 172,367, dated November 18, 1885; a patentin Victoria, No. 4,662, dated August 9, 1886, and a patent in New SouthWales, No.

1,939, dated October 6, 1886,) of which the following is aspecification.

Our invention consists in combining with the slide-valves ofsteam-engines and coin pressed-air engines an oscillating valve (orvalves) and the appliances hereinafter described for the purpose ofautomatically cutting off the steam or compressed air at any desiredposition of the stroke of the slide-valve, and thereby using the steamor compressed air expansively and regulating the speed of the engine.

We will describe our invention as applied to a horizontal steam-engine.

We mount upon the slide-valve of the steamengine an oscillatingflap-valve, the arms of which are slightly cranked and are situated overor opposite the steam'ports in the slidevalve. By the motion of theoscillating valve upon its joint or center one of the steam- 55 ports inthe slide-valve is opened and the other steam-port at the same timeclosed. Situated in the steam-chest'and near the oscillating valve is aregulator acted upon by the slide -valve,. the oscillating flapvalve mayturn in a bearing fixed in the steam-chest and be operated from theshaft of the engine.

Figure 1 of the accompanying drawings represents in horizontal section,and Fig. 2 in plan, the slide valve of a steam-engine to which anoscillating flap-valve is applied, the 5 5 faces of the two steam-portsin the slide-valve being situated in the same plane. Fig. 3 representsin horizontal section a slide-valve carrying an oscillating flapvalve incombination with a regulator in connection with the gov- 6o ernor of theengine, the faces of the two steamports in the slide-valve beinginclined to one another. Fig. 4 represents in horizontal section amodification in which the faces of the steam-ports in the slide-valveare turned from 6 5 one another, and the ends of the arms of theoscillating fiap-valve are furnished with covers for closing andvopening the said steam'ports. Fig. 5 represents in horizontal sectionanother modification, in which each steam-port in the slide-valveisprovided with an oscillating flap-valve. Fig. 6 represents in horizontalsection, and Fig. 7 in plan, the arrangement in which the oscillatingvalve is not carried by the slide-valve, but turns ona bearing fixed inthe steam-chest and is operated from the shaft of the engine.

In Figs. 1, 2, 3, 4., and 5 of the drawings the oscillating flap-valveis marked a a", the said valve being mounted upon the slidevalve b andturning upon the center a. The slide-valve b has a reciprocating motiongiven to it in the ordinary way from the shaft of the engine. In theslide-valve b are the usual steamports, d and e.

d 6 (see Figs. 3, 4, and 6) are the passages in the fixed steam-chest,communicating, respectively, with the ends of the steam-cylinder of theengine. The oscillating flap-valve o a has a slightly-crankedfigure-that is, its 0 two arms are not in the same line, so that by themotion of the valve upon its center 0 one of the arms of the valvecloses one of theports d or e, and the other arm at the same time opensthe other port.

The regulator represented in Fig. 3 is carried by the horizontal axis orshaft 9, connected by suitable gearing with the governor, so that anangular motion can be given to the regulator when required for changingthe speed of the engine. The regulator consists of two arms, f f havingthe form represented in the drawings. As the slide-valve 1) moves in oneor other direction, the oscillating flap-valve a a", carried with it, iscaused to oscillate at the proper times upon its joint 0 by the arms ofthe said flap-valve traveling over the arms f f of the regulator foralternately opening and closing the steam-ports d e in the saidslide-valve b.

In Fig.3 the slide-valve b is represented as moving in the direction ofthe arrow, the steamport 6 being closed by the raised arm a of theoscillating valve and the steanrport d opened by the other arm, a, ofthe said oscillating valve. Before the motion of the steam-piston inthecylinder. is reversed the arm a of the oscillating valve has reachedand travels upon the regulator-arm f, thereby raising or starting thesaid arm a. At the same time the port d in the slide-valve is opened tothe passage d to the cylinder, and steam from the steamchest passes bythe open port d and passage d to the cylinder, the other port, 6, beingat the same time opened to the exhaust. By the pressure of the livesteam escaping from the steam-chest through the port d the arm a of theflap-valve, which has been lifted or started by the regulatingarm f, isfully raised by the said steam and closes the port d, the other port, 6,being opened by the descent of the other arm, a", of the flap-valve. Thesteam in the steam-chest is thus cut off from the cylinder, the steamsupplied to the cylinder being used expansively. The motion of theslidevalve being reversed, the same action takes place at the oppositeside of the oscillating valve-that is, the now depressed arm a of theoscillating valve is, when the slide-valve makes its return-stroke,lifted or started by traversing the armf of the regulator, and by thepressure of the live steam escaping from the steam-chest through theport 6 the arm a of the flap-valve, which has been lifted or started bythe regulating-arm f is fully raised by the said steam and closes theport 6. So long as the engine is working at its normal or arranged speedthe steam is automatically cutoff at the proper times by the action ofthe oscillating valve or a and regulator f f but when the speed of theengine exceeds its normal speed the regulator ff is operated upon by thegov. ernor and turned through such an angle as will cause the steam tobe out off earlier and the speed of the engine thus regulated.

In the modification Fig. 4 the regulator f ports 11 e.

In the modification Fig. 5 an oscillating flap-valve, a a", is appliedto each steam-port d e' in the slide-valve b, each valve having aseparate regulator, f f for operating it, mounted on the shaft g,connected with the governor.

In the modification Figs. 6 and 7, where an oscillating flap-va1ve,a a,is situated in the steam-chest, the said oscillating valve is actuatedby a regulator in the form of a tappet or lever-arm, z, jointed to thebearing in the steam-chest f. A reciprocating or rocking motion is givento the said tap pet or lever-arm z through the rod i, on the end ofwhich the link It works, the latter being connected through the rod Zwith an eccentric on the shaft of the engine. The link is also raisedand lowered by the action of the governor, which is geared to it throughthe rod m and other connections. After the slide'valve has made aportion of its stroke from left to right the action of the eccentricmoves the rod 1'' in the direction of the arrow in Fig. 6 and turns thetappet or lever-arm 1' upon its center. The head of the said tappet isthereby made to lift the arm a of the flap-valve and close the port 01,the other arm, a opening the port 6. In this way the steam is out off atthe required position of the stroke of theslide-valve. The length of thetravel of the tappet or lever-arm i is determined by the position of thelink 70, the position of the latter being regulated through the governorof the engine.

Having now particularly described and ascertained the nature of ourinvention and the manner of performing the same, we declare that weclaim as our invention of improvements in automatic cut-off mechanismfor the slide-valves of steam-engines and compressedair engines- Thecombination,with a reciprocating slidevalve, of an oscillatingflap-valve pivoted between its ends below the valve, and a movableregulator connected with a governor and acting alternately on the saidopposite ends of the pivoted valve, substantially as described.

JOHN HENRY TANGYE. [L s.] WILLIAM JOHNSON, JR. 1.. s.]

